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For those interested, i’ve archived the objective.
Running on a Hiking DDS238-2 WIFI with the firmware updated to Tasmota 9.4.0.2 or higher :

Documentation:

Basic settings:

{“NAME”:“Hiking DDS238-2 WIFI”,“GPIO”:[0,2272,0,2304,0,0,0,0,0,0,320,0,32,0],“FLAG”:0,“BASE”:54}

Backlog TuyaMCU 33,20; TuyaMCU 32,18; TuyaMCU 31,19;  TuyaMCU 37,101;
Backlog SetOption72 1; VoltRes 1; WattRes 1;

Rule1 
  ON System#Init DO backlog tuyasend1 1,1; RuleTimer1 5 ENDON 
  ON Rules#Timer=1 DO backlog TuyaSend8; RuleTimer1 5 ENDON

Rule2 
ON energy#power DO Var3 %value% ENDON
ON energy#voltage DO Var1 %value% ENDON
ON energy#total DO Var4 %value% ENDON
ON energy#apparentpower DO Var5 %value% ENDON
ON energy#reactivepower DO Var6 %value% ENDON
ON energy#Factor DO Var7 %value% ENDON
ON energy#Today DO Var8 %value% ENDON
ON energy#Yesterday DO Var9 %value% ENDON
ON energy#current DO Var2 %value% ENDON
ON Wifi#Connected DO backlog buzzer 2,1,1; RuleTimer2 5 ENDON 
ON Wifi#Disconnected DO backlog buzzer 1,3,1; RuleTimer2 0 ENDON 
ON Rules#Timer=2 DO backlog event SENDEMON; RuleTimer2 5 ENDON
ON event#SENDEMON DO WEBSEND [emon.server.com:80] /input/post.json?node=PowemeterLago&json={P:%Var3%,I:%Var2%,V:%Var1%,S:%Var5%,Q:%Var6%,Pf:%Var7%,Total:%Var4%,Today:%Var8%,Yesterday:%Var9%}&devicekey=YOURKEY ENDON

Backlog Rule1 1; Rule2 1;

restart 1

Advanced settings:

This resets the Today, Yesterday and Total kWh counter to the hardware value (cant reset the total hardware value);
Backlog EnergyReset1 0; EnergyReset2 0; EnergyReset3 0

Disables send state and sensor message interval (s):
TelePeriod 0

Security options:

WebPassword new_password
WifiConfig 4

Update rule 1 to disable the power off of the main relay, so that it’s not possible to shutdown the building power by accident:

Rule1 
  ON System#Init DO backlog PowerOnState 4; tuyasend1 1,1; RuleTimer1 5; ENDON 
  ON Rules#Timer=1 DO backlog TuyaSend8; RuleTimer1 5 ENDON

Add a Buzzer to GPIO15

{“NAME”:“Hiking DDS238-2 WIFI”,“GPIO”:[0,2272,0,2304,0,0,0,0,0,0,320,480,32,0],“FLAG”:0,“BASE”:54}

Triger buzzer when current is higher that 20A:

Rule3
  ON energy#current>20 DO buzzer -1,1,30 ENDON
  ON energy#current<20 DO buzzer 2,1,1 ENDON

Backlog Rule3 1; Rule3 5;
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